1 / 16

Concept of Aircraft Maintenance

Section 3. Concept of Aircraft Maintenance. Types of Aircraft Maintenance. Maintenance. Scheduled. Unscheduled. Unplannable. Routine maintenance check Replacement of life limited items Cleaning. Plannable. Activities originated from: Cabin log book Technical log book

solada
Download Presentation

Concept of Aircraft Maintenance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Section 3 Concept of Aircraft Maintenance

  2. Types of Aircraft Maintenance Maintenance Scheduled Unscheduled Unplannable • Routine maintenance check • Replacement of life limited items • Cleaning Plannable Activities originated from: • Cabin log book • Technical log book • Ground findings • Performance of modification originated work • Rectification of deferred defects

  3. MAINTENANCE DEFINITION Those actions required for restoring or maintaining an item in serviceable condition General Mainly unscheduled maintenance limited to the replacement of faulty components that will have immediate or short term influence on aircraft operations (MMEL). • TYPES • Unscheduled • Scheduled • Servicing • LEVELS • Line ( Ramp ) • Hangar or Main base • Workshop

  4. General TYPES OF MAINTENANCE Scheduled: Maintenance performed at defined intervals to retain an item in a serviceable condition (availability, safety and reliability to their inherent levels) Scheduled maintenance action is performed according to the Maintenance Program requirements Unscheduled (or corrective): Maintenance performed to restore an item to a satisfactory condition by providing correction of a known or suspected malfunction and/or defect. Unscheduled maintenance action is performed if there is a pilot report or a complaint from the scheduled maintenance. Servicing: Any act of replenishmentfor the purpose of maintaining the inherent design operating capabilities of an item.

  5. DIRECT OPERATING COST BREAKDOWN 50 50 Material Labour Maintenance (12%) 50 40 10 Structure Powerplant Systems General Unscheduled (8.5%) Scheduled (3.5%) Depreciation / Finance (41%) Fuel (25%) Insurance (2%) Landing / Navigation taxes (9%) Crew (11%) DMC = 700 $/FH

  6. Types of Scheduled Maintenance ► Light or Line Maintenance: •  Preflight Check •  Daily Check •  Weekly Checks •  A (Multiple A) and B Checks • ► Base or Heavy Maintenance: •  C (Multiple C) and D Checks • ► Shop or Component Maintenance: •  Maintenance on components when removed from aircraft

  7. Introduction Operational Aspects Operational interruption or disturbances have repercussions on the following areas: • Passengers Comfort • Corporate Image Of The Operator • Operating Cost WHAT KIND OF SCHEDULED MAINTENANCE ARE WE PREPARED TO TOLERATE IN ORDER TO OPTIMISE THE ABOVE CRITERIA ? COST OF SCHEDULED MAINTENANCE < COST OF FAILURE CONSEQUENCES

  8. Typical inspection interval Introduction Check type Interval Content Pre-Flight Pre-Flight General visual from ground for signs of obvious discrepancies or damage such as fluid leaks, FOD, lightning strike. Check logbook . Check engine oil levels and replenish if necessary Terminal Check Each terminal Pre-flight plus tires, tire pressure, wheels and (Ramp) stop brakes. Cabin check.

  9. Typical inspection interval Introduction Check type Interval Content Service Check 8 Cal. days Hydraulic qty, escape slide gas pressure, oxygen pressure, brake wear, IDG oil, APU oil, oleo pressures. Visual check of engine inlet and exhaust. Optional check of CMS for degraded fault tolerance (to avoid potential No Go situation) 1A-Check 500 FH Exterior general visual from ground. Interior general visual cockpit, cabin, cargo compartment, avionics, electrical, hydraulic and ECS equipment bays, landing gear, landing gear bays ad doors. IDG oil.

  10. Typical inspection interval Introduction Check type Interval Content 2A-Check 1000 FH Simple operational checks (failure finding tasks) from cockpit which cannot be accomplished at 4A and above. Inspection of engine fan blades. Check engine chip detectors. Engine starter oil change. Landing gear lubrication. 4A – Check 2000 FH Lubrication of some flight control items in accordance with past service experience. Simple operational checks (failure finding tasks) which cannot be accomplished at C and above. 8A – Check 4000 FH Check fuselage drainage system

  11. Typical inspection interval Introduction Check type Interval Content 1C-Check 15 months External general visual inspection of areas with moderate sensitivity to damage or deterioration such as lower and mid fuselage, windows, doors, wing lower surfaces, flight control surfaces, horizontal and vertical stabiliser leading edges and pylons. General visual inspection of power plant and engine with cowls open, landing gear and landing gear bays, wing fixed leading edge, rear fuselage and tail cone. Cleaning or replacement of air conditioning filters. Systems operational checks (failure finding tasks). Flight control general lubrication and gearbox oil replenishment. Hydraulic system internal leakage. Cabin check. Check drainage systems.

  12. Typical inspection interval Introduction Check type Interval Content 2C-Check 30 months External general visual inspection of areas with low sensitivity to damage or deterioration such as upper fuselage, horizontal and vertical stabilisers and wing top surface. Internal general visual inspection installations in equipment bays and pylons. Intermediate Layover (4C) 60 months Internal general visual inspection of structure and installations in areas of moderate to high sensitivity to damage or deterioration such as cargo compartments, area below cargo and cockpit floors and below toilets and galleys. Internal general visual inspection of wing in sump areas. Systems operational and functional checks. Detailed cabin check including floors in high traffic areas, galleys and toilets.

  13. Typical inspection interval Introduction Check type Interval Content Major Layover (8C) 120 Months General and detailed external and internal structural (sampling or 100%) inspection for corrosion and fatigue damage. Systems operational and functional checks. Remarks: Aircraft on jacks Note: some operators may wish to integrate items into C- Check packages.

  14. Boeing Typical Inspection Interval 6,000 FH (Sys.)3,000 FC (Struc.) 500 FH (Sys.)300 FC (Stru.) 757 737-100737-200 125 750 3,000 20,000 170 700 2,840 21,000 737-300737-400737-500 747-400 Cathay Pacific 200 3,200 20,000 650 220 6,750 3,300 30,000 21,500 500 or 70 days 150days 365 Days or 3000 hrs 777(Cathay Pacific) ? 727 80 400 16,000 5,000 18,500 MD-80 450 3,500 15,000 Introduction Lettercheck Recommended initial interval (FH) World weighted fleet interval (FH) D(Structural Inspection) D(Structural Inspection) A B C A B C Aircraft

  15. Airbus Typical Inspection Interval A310 A300-600 400 FH Initial: 250 FH 15 MonthsInitial: 12 months FD threshold: 18,000 FCED threshold: 10/7.5/5/2.5 years 5 Years Cathay Pacific FD threshold: 24,000 FCED threshold: 9/5/2.5 years A319A320A321 500 FH 15 Months 5 Years Cathay Pacific FD threshold: 20,000/8,000 FCED threshold: 10/5/2.5 years 700 FH500 FH 18 months 15 months A330A340 Objective:750 FH Objective:24 months A380 Introduction Lettercheck Recommended interval D= 4C Structural inspection Aircraft A C

  16. Economics aspects of scheduled maintenance Introduction C C Block check plan M H 4A 4A 4A 2A 3A 2A 2A 2A A A A A A A 1 2 3 4 1 year 2 year Semi equalised plan M H A + x% of 2A + y% of 4A 1 2 3 4 1year 2year

More Related